Biomass in tussock tundra experimental plots near Toolik Lake, North Slope, AK (68 degrees 38N, 149derees 34W). There were five harvests in 1983. This file is the May 21-22, 1983 harvest.
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Plots were setup in June 1981 with annual fertilization treatments of 10 g/m2 Nitrogen (as NH4NO3) and 5 g/m2 Phosphorous (as triple superphosphate) were applied. Greenhouses and shade houses were annually set up in late May or early June and removed in the end of August or early September. There are 4 replicate blocks, each containing 1 replicate of each of the following treatments.
Greenhouse fertilized (GHNP)
Notes: For 1983-84 harvests in the original file, Quadrats Q1 - Q5=Block 1, Q6 - Q10=B2, Q11 - Q15=B3, Q16 - Q20=B4. For example, Q6 from 1983 is the same as B2Q1 in 1989. In this file the quadrats were renamed to B1Q1 style where the number following the B is block number and the number following Q is quadrat number.
Missing values are represented with blank spaces.
Biomass quadrats, size 20x20 cm, were taken from Toolik tussock site. Five quadrats were taken from each of four blocks. All aboveground biomass plus belowground stems and rhizomes were clipped in 20x20 cm quadrats. Five quadrats were randomly located along line transects in each of four replicate blocks in each treatment. Aboveground biomass is considered "within" the quadrat if it is associated with a meristem that is within the quadrat. Quadrats were sorted within 24 hours into species and then into tissue type. Depending on the harvest, tissue types can be broad categories, i.e. above and below, or more detailed, i.e. inflorescences, new growth, old growth, etc. They were then dried at 50-70 degrees C in a drying oven. After several days in the oven samples were weighed to nearest milligram. Samples are then returned to Woods Hole for nutrient analysis. Details are given in Shaver and Chapin (Ecological Monographs, 61(1), 1991, pg. 1.)
There were five harvests in 1983. Below are the original harvest numbers, harvest dates and the old filenames. The data was combined in 2004 with all the harvest now in file 1983gsttbm.xls
Harvest Treatment Date Old Filename = Filename May 1994
4 control May 21, 22, 1983 TLK83CT4.wkq 83gsttb4.xls
4 fertilized May 21, 22, 1983 TLK83FT4.wkq 83gsttb4.xls
4 greenhouse May 23-25, 1983 TLK83GH4.wkq 83gsttb4.xls
4 greenhouse fert. May 23-25, 1983 TK83GHF4.wkq 83gsttb4.xls
4 shade May 22, 24, 25, 1983 TLK83SH4.wkq 83gsttb4.xls
5 control June 14, 15, 1983 TLK83CT5.wkq 83gsttb5.xls
5 fertilized June 16, 17, 1983 TLK83FT5.wkq 83gsttb5.xls
6 control July 1-4, 1983 TLK83CT6.wkq 83gsttb6.xls
6 fertilized July 1-4, 1983 TLK83FT6.wkq 83gsttb6.xls
7 control July 26, 27, 31, 1983 TLK83CT7.wkq 83gsttb7.xls
7 fertilized July 26-28, Aug.1, 83 TLK83FT7.wkq 83gsttb7.xls
7 greenhouse July 28-30, Aug. 2-3, 83 TLK83GH7.wkq 83gsttb7.xls
7 greenhouse fert. July 28, 29, Aug. 2-4, 83 TK83GHF7.wkq 83gsttb7.xls
7 shade July 30-31, Aug. 3-4, 83 TLK83SH7.wkq 83gsttb7.xls
8 control August 20-22, 1983 TLK83CT8.wkq 83gsttb8.xls
8 fertilized August 22, 23, 1983 TLK83FT8.wkq 83gsttb8.xls
Data were entered into Quattro spreadsheets as weights in grams, to the nearest milligram. Categories are same as on data sheets
Missing values are represented with blank spaces.
Tissue categories codes: v0 is a new graminoid tiller that does not have any green tip. CYS is graminoid current year senescence.
New Above: includes blade, sheath, v0, CYS blade, CYS sheath, inflorescence, inflorescence bud, new leaves, new stems, and new above (for Forbs and mosses).
Old Above: includes old leaves and old stems.
Below: includes below stems, rhizome and below (for forbs).
Log of changes:
5Apr95. Added comma delimited data and document to database. Original file is in excel 5,. JimL.
Nov2004. Combined the 5 harvest into one file and completed the variable description. JL
Version2: Creaded Excel metadata form. Changed title, filename to full year and added attribut table. 10Jan06 JimL
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated the metadata sheet and eml to 2.1
Version 6: Taxonomic coverage data updated. Updated to newer metadata form (with sites sheet). CH March 2013.
Version 7: updated site info to reflect description (1981 plots)
Version 8: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
Version 9: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015
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